Hey guys, so I finally got my lower receiver today, and was putting everything together. It was going decent, then I ran into a problem. I pushed my front pivot pin all the way through before I attached the upper. I was following the step by step instructions from AR15.com, and they didn't mention that I had to attach the upper first before sliding the pin through. So is there a way to move the pin without damaging the spring? Also, I'm building a CA legal AR15, so I got the Prince mag lock kit, but I still don't see how I can load the rifle. Some people have mentioned to break open the rife and top load, but that would mean removing the stock and then the rear takedown pin. Am I missing something, or is this correct?